there are rules to painting. In painting, all the little things matter. The biggest rule is to know when to stop painting an a certain area. Never stop in the middle of a panel. Always go through from one side to the other or back away from the panel while still spraying. Always spray behind what your arm has already crossed. Never start painting in the middle of a panel. Always paint in temperatures between 75 to 85. Always use some sort of wind draft to pull the mist away from your car. These are just a few that I know. There are alot of things that go into it, but it pays off if you can pull it off.